The item box storage display is moved to the middle in the screen, based off Super Mario Kart / Mario Kart 64 and the frame texture is from Super Mario World. This is inspired by fishguy6564. :) https://www.youtube.com/watch?v=NHVlPTlTxtM
I used a Hex editor to modify the Layout file 0x1C8DEAB3 (aka .bclyt) under race.szs, by replacing bytes E7 A0 on Offset location 256. It was done by myself.
Those retro item icons were made by fishguy6564 too. https://www.youtube.com/watch?v=Nrq7tHN0HtE